For generations, the process of buying and selling a home in the Boston area never really changed. A homeowner would try to estimate the market value of their house, then tack on a little extra to give themselves some negotiating room. That figure would become the listing price. Buyers would then try to determine how much less than the full price they could offer and still get the home. As a result, the listing price was generally the ceiling of the negotiation. The actual sales price would almost always be somewhat lower than what was listed. It was unthinkable to pay more than what the seller was asking.